CYA fluctuating

[RussellC]

Hi, I have a question about the CYA test. When I go my new house the CYA was 50/60. It is an SWG pool. I tried to raise it to 70 to start so I don't overshoot it so I added 2 lbs cya in a sock in the skimmer. I finally tested it at 70 about 24-48 hours after adding. Now a week later when I test I'm lucky to get 50. I tried the standard 50 sample and I get near 50 every time. I have had to add about and inch or 2 of water since adding the CYA. I have also add a ton of calcium to increase that from under 200, can that take away CYA or is something consuming CYA or should I add more?

Numbers as of last night:

FC - 9
CC - 0
pH - 7.5
CYA - 50/60?
TA - 100
CH - 375

 

[tim5055]

CYA does not fluctuate, testing does. Calcium does not consume CYA.

You say you have added water, is that because of evaporation or water leaving the pool through physical means, like back washing?

If you were in the 50/60 range and added two pounds, it is still there unless you pumped water out of the pool.

 

[RussellC]

I only added water due to evaporation. It was only 1 inch above the skimmers when I took possession.